215138602488 has 128 divisors (see below), whose sum is σ = 562167889920. Its totient is φ = 68549483520.

The previous prime is 215138602457. The next prime is 215138602493. The reversal of 215138602488 is 884206831512.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11606668 + ... + 11625188.

It is an arithmetic number, because the mean of its divisors is an integer number (4391936640).

Almost surely, 2^215138602488 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 215138602488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (281083944960).

215138602488 is an abundant number, since it is smaller than the sum of its proper divisors (347029287432).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

215138602488 is a wasteful number, since it uses less digits than its factorization.

215138602488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18797 (or 18793 counting only the distinct ones).

The product of its (nonzero) digits is 737280, while the sum is 48.

The spelling of 215138602488 in words is "two hundred fifteen billion, one hundred thirty-eight million, six hundred two thousand, four hundred eighty-eight".